[en] In the analysis of coincidence RDDS experiments one uses the Differential Decay Curve (DDC) Method to determine lifetimes of excited states. Experiments with small recoil velocities, thus small Doppler shifts, enforce the use of narrow coincidence gates to determine peak intensities. This results in a loss of statistics. As an alternative to the application of gates, we present the fit of 2-dimensional functions to the γγ coincidence data. This approach has been studied on data taken in a RDDS measurement for the ground state band of ¹⁶⁸Yb. The ¹⁸O(¹⁵⁴Sm,4n)¹⁶⁸Yb^* fusion evaporation reaction was induced by an 80 MeV ion beam of the tandem accelerator facility in Cologne. The target was mounted in the Cologne coincidence plunger device. Lifetimes from the 4₁⁺ to the 10₁⁺ states have been extracted. The method is discussed and the results are compared to the CBS rotor model in the context of centrifugal stretching.